The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 20, 2004
Filed:
Mar. 18, 2003
Applicant:
Inventors:
Assignee:
Kawatetsu Mining Co., Ltd., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01G 9/04 ; H01G 9/145 ; B22F 1/00 ; C22C 2/702 ;
U.S. Cl.
CPC ...
H01G 9/04 ; H01G 9/145 ; B22F 1/00 ; C22C 2/702 ;
Abstract
A niobium powder is provided for producing a niobium capacitor enhanced in the thermal stability of oxide films on niobium, with less leak current and less deterioration of leak current after application of thermal loads. The niobium powder contains form 0.005 to 0.10 mass % of hydrogen and from 0.002 to 5 mass % of sulfur and, further preferably, one or both of magnesium and aluminum in an amount from 0.002 to 1 mass % in total. The specific surface area of the powder is 1 to 10 m /g and the average particle diameter of the secondary particles is 10 to 200 &mgr;m.